In a large pot, bring salted water to a boil. Add the pasta and cook according to the package instructions until al dente. Drain and set aside.

In a large skillet over medium heat, brown the ground beef (or turkey). Ensure the meat is fully cooked, breaking it apart with a spatula as it cooks.

Stir in the taco seasoning and add the black beans, corn, and diced tomatoes. Mix thoroughly and simmer for about 5 minutes, allowing the flavors to meld.

In a large mixing bowl, combine the cooked pasta, meat mixture, sour cream, and one cup of shredded cheese. Stir well until everything is evenly coated.

Spoon the mixture into a greased 9x13-inch baking dish, spreading it evenly. Top with the remaining cheese and salsa.

Preheat the oven to 350°F (175°C) and bake for about 20-25 minutes, or until the cheese is bubbly and slightly golden.

Once out of the oven, let it sit for a few minutes before serving. Top with your choice of sliced avocados, additional sour cream, or fresh cilantro.